Green Lake No. 1
Green Lake No. 1 is a rockfill dam located in Boulder County, Colorado, built in 1940. It carries a Low hazard potential classification.
About Green Lake No. 1
The primary purpose of Green Lake No. 1 is water supply. The dam stores water for municipal, industrial, or agricultural use, helping ensure a reliable supply for the surrounding area. The dam is owned by City Of Boulder (clark, Kevin) (local government). It impounds the North Boulder Creek-tr near Boulder.
The dam stands 24 feet tall and stretches 270 feet across, creates a reservoir covering 10 acres, and has a maximum storage capacity of 60 acre-feet. Completed in 1940, the structure is well-established, with more than 75 years of service.
This dam has a low hazard potential classification, meaning that failure would cause minimal damage, limited primarily to the dam owner's property, with no expected loss of life. The most recent inspection on record was 07/15/1985. That was over 40 years ago.
Search for dams near your address to see all dams in your area with hazard classifications and safety data.
Location
| State | Colorado |
| County | Boulder |
| Nearest City | Boulder |
| River/Stream | North Boulder Creek-tr |
| Coordinates | 40.05000, -105.60557 |
Physical Characteristics
| Dam Type | Rockfill |
| NID Height | 24 ft |
| Dam Height | 24 ft |
| Dam Length | 270 ft |
| Year Completed | 1940 (86 years old) |
Storage & Hydraulics
| NID Storage | 60 acre-ft |
| Max Storage | 60 acre-ft |
| Normal Storage | 40 acre-ft |
| Surface Area | 10 acres |
| Max Discharge | 149 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Water Supply |
| Owner | CITY OF BOULDER (CLARK, KEVIN) |
| Owner Type | Local Government |
| Hazard Classification | Low |
| Condition Assessment | Not Rated |
| Last Inspection | 07/15/1985 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | CO01778 |
| Federal ID | CO01778 |
| More Info | State Dam Safety Program |